Yeah, I like my first appearances within the content of a story myself. With 'Vinci, I will always consider Noble Causes #3, a first appearance(because BAM! He pops up in the middle of a story) and not that Savage Dragon or Masters of the Universe stuff. That preview stuff don't belong in Registry sets, IMHO. I don't want to see a Transformers or Spike book in my Registry set, that I have to grade for the sake of having a complete set because of advertisements. Granted, I have the first two L&K preview books ready to be graded when I get better, but that's because I was getting bored and like my other Joe Hill books, they will just go into the shortbox and the excess ones to my friends. In no way, am I gonna submit all 24 L&K books(including variants). There was 36 total preview books that went well into L&K #2's release date. I wouldn't even request the IDW: First 10 Years book, because it's outside the continuity.